Telephone-call system



(Ho llodel.) E. T. GILLILAND.-

' TELEPHONE CALL SYSTEM. No. 525,703. Patented Sept. 11, 1894.

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UNITED STATES PATENT OFFICE.

EZRA T. GILLILAND, OF PELIIAM MANOR, NEW YORK, ASSIGNOR TO THE AMERICANBELL TELEPHONE COMPANY, OF BOSTON, MASSACHUSETTS.

TELEPHONE-CALL SYSTEM.

SPECIFICATION forming part of Letters Patent No. 525,703, datedSeptember 11, 1894. A Application filed January 11, 1894. W. Nb.496,490. (No model.)

T at whom it may concern.-

Be it known that I, EZRA T. GILLILAND, a citizen of the UnitedStates,-residing in Pelham Manor, in the county of Westchester and Stateof New York, haveinvented certain new and useful Improvements inTelephony, of which the following is a specification.

This invention relates to telephony. It has for its object toautomatically change the circuits at a telephone station accordingly asthe telephone is in or out of use so as to leave in the line circuitonly the resistance of the call-receiving instrument or of thetelephone. It is desirable to cut out of circuit the resistance of thetelephone coil in the normal condition of the apparatus at a telephonestation, so that the energy imposed upon line at the distant callingstation may have a maximum effect upon the call-receiving apparatus atthe called station. It is usual to produce this result by a gravityswitch capable of assuming two positions to include in the line circuitthe call-receiving instrument orthe telephone instrument, the weight ofthe telephone normally resting upon the gravity switch and cutting outthe telephone coil. I accomplish this result automatically by using asthe controlling factor theposition of the telephone coil when in or outof use.

In carrying out my invention I mount upon the telephone receiver acircuit-changer capable of assuming two positions according to theposition in which the telephone stands under the action of gravity, andI so con-- struct the receiver that one who uses it will necessarilyhold it in a position to cut in .the telephone coil. I eflect thisresult by mounting the switch so that gravity will act upon it in a linepassing parallel or approximately parallel to the handle, placing themouthpiece preferably in the plane of the handle so that in using themouth-piece it will necessarily be on a higher plane or level than thehandle, and provide the instrument with a supporting device so relatedto it that the mouth-piece will normally occupy a lower level than thehandle, thus maintaining the switch in a position to cut out thetelephone coil and cut in call-apparatus.

I also employ a special type of calling battery, in which.

the electrodes are normally out of the solution and complete theconnections for the home calling instrument, but when immersed in thesolution the battery is interposed in line.

The several features of novelty of the invention will be moreparticularly hereinafter described and will be definitely indicated inthe claims appended to this specification.

The accompanying drawing shows an organization embodying myimprovements.

1 represents a permanent magnet and 2 the case of a telephone, thediaphragm and mouth-piece being removed for clearness of illustration. Asoft-iron core 3 is mounted upon the permanent magnet at right angles tothe axial line of the magnet, and supports a telephone coil as shown. Apivoted lever 4 is mounted in the case in a plane to vibrate axiallywith the magnet. Co-operating with the lever are two contact stops 5, 6,flexible conductors 7, 8, 9 leading to binding posts 10, 11, 12. Post 12connects with ground; post 11 with a contact stop 13 normally connectedto line; and post 10 with a single-stroke bell 14 and thence with stop13. Conductors 7 and 9 connect with the terminals of the telephone coil,and conductor 7 with stop 6 normally disconnected electrically withlever 4. Lever 4 normally short-circuits the coil through conductorsleading to the pivotal point of lever 4 and stop 5. The handle of thetelephone formed in this case of the magnet is provided with an eye 15or other supporting device by which it may be suspended upon a fixedsupport. Between ground and line is placed a dip battery 16 theelectrodes of which may be depressed into the solution by a handle. Theelectrodes are mounted upon a sliding frame and are normally held abovethe solution by a spring as shown. One electrode connects with groundand the other with a contact of a mechanical interrupter one part ofwhich connects with line. Any suitable organization for throwing thebattery current to line when the electrodes are dipped into the solutionmay be adopted. The interrupter may be any device for making andbreaking the circuit a number of times during depression of theelectrodes; as shown it comprises a fixed member 17 of conductingmaterial'provided with a series of With the organization described itwill be seen that in the normal position of the parts 10 the apparatusis in condition to receive acall from line,theline currentsproceedingthrough the battery and interrupter at a distant station and enteringthe called station through contact 13, passing thence through bell 14,15 binding post 10, cord 7, over the short-circuit around the telephonecoil, through lever 4, and contact 5 to cord 9, and thence to ground bybinding post 12. The called operator takes the telephone fromits'support, and in 20 placing it to his mouth or ear naturally holds itso that the mouth or ear piece stands on a higher level than the handle.Thelever 4 will then drop away'from contact 5 and engage contact 6, thuscutting into circuit the tele- 2 5 phonecoil'over two branches, one byway of bell, binding post 10,-and cords 7'and 9, and the other by way ofbinding post 11, cord 8, stop 6, lever 4, and cord 9. Conversation maythen be exchanged between the two op- 0 erators, the telephones actingas magnetotransmitters. To adapt the system for use with an=induction'coil and carbon transmitter suitable commutation of thetransmitter circuit would-also have to be efiected. In 5 calling upa-distant station,- handle 19 is depressed. Thetelephone apparatusis'thus first cut off by opening the circuit at contact 13. Theelectrodes are thenimmersed, and simultaneously a series of interruptedcurrents are 40 sentto-line through interrupter 17, 18. The bell lt-might of course be placed on the'line side of the circuit so that-thehome bell would Excellent results I mally closed circuit includingacall-reeeivil" ring-as well as the distantbell in calling. I prefer,however, to put the bell on thegnonnd side of contact 13 so that itsresistance will; not be added to the circuit when the bell Q, notneeded. 1

'In lieu of the specific organization bend; described for automaticallyshifting the nections when the instrument is taken its support, othersuitable organizations be adopted. l

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A telephone call system comprisingamm instrument, a dip battery fortransmitti calling current and connections for ope the circuitandcutting in the battery immersion ofits electrodes.

2. -A telephone call-apparatus comprisillfl call-receiving instrument innormally 0M relation to the line terminals, a dip bat-tow means foropening the circuit and i ing said battery during the immersion ofelectrodes, and an interrupter adapted to; actuated simultaneously withthe elect!!! for producinga pluralityof current impnw during immersion.

3. A telephone system comprisingeall-Gfi. paratus normally connected toline, IHLI IQ-y matic switch for cutting in the telephone 0 d! whenthetelephone is in use, a dip be and means for opening the branch th thetelephone apparatus and closing the tery on line when its electrodes areim In testimony whereof I have hereunto sub-i scribed my name this 6thday of January,"

. EZRA T. GILLILAND.-

Witnesses:

RoBr. H. READ, JOHN T. MURPHY.

